<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>布局</title>
    <style>
        header{
            background: red;
            height: 100px;
        }
        aside{
            background: yellow;
            width: 30%;
            height: 400px;
            float: left;
        }
        article{
            background: blue;
            width: 70%;
            height: 400px;
            float: left;
        }
        footer{
            background: blanchedalmond;
            height: 100px;
            clear: both;
        }
    </style>
</head>
<body>
    <header>头部</header>
    <aside>侧边</aside>
    <article>文本区域</article>
    <footer>底部</footer>
</body>
</html>